Added descriptions of existing scripts

BSB_LAN/custom_functions/README.md

@@ -14,3 +14,27 @@ To use these scripts, you have to do two things:
 
 Theoretically, you can use several of these custom functions at the same time, and sometimes it's as easy as just copy-pasting each code segment one after the other for each file. But do take note that this is similar to writing code for BSB-LAN itself, so be aware of what you are doing.
 **Please understand that we cannot give any individual support in case of errors or problems!**
+
+# DHT22_sensor_controls_fan
+
+This script reads the temperatures from two DHT22 sensors (one outside and one inside) and turns on a fan connected to GPIO 6 in case the 
+absolute inside humidity is higher than the absolute outside humidity and the inside temperature is higher than 15 degrees celsius.
+
+# Map_DS18B20_sensors_to_custom_floats
+
+This script takes the readings of DS18B20 sensors and writes them to the custom floats parameters (20700 and above) for easier access.
+
+# Modbus_Interface
+
+This set of scripts enable BSB-LAN to be accessed via Modbus. Parameters can be read and written. However, take note that no data type
+conversion takes place in this script, so only unsigned 16-bit integer values will be transmitted correctly. All other kinds of data
+types will have to be encoded/decoded accordingly.
+
+# Send_NTP_time_to_heater
+
+This script connects to an NTP time server and writes the accurate time to the heater's internal clock.
+
+# Send_room_temperature_based_on_MAX_thermostats
+
+This script collects the current temperature of registered MAX! thermostats, calculates an avaerage and sends this average as the current
+room temperature to the heater (via parameter 10000).